Method of casting separable fastener stringers with stringer tape angularly to the scoops



y 2 I. H. MORIN 3,034,176

METHOD OF TING SEPARABLE FASTENER STRINGERS ARLY W STRINGER TAPE ANGUL TO THE SCOOPS Filed Feb. 23, 1960 27 A 1 Z5 5 /7 0 22 L l /l" INVENTOR. Lou/5 H MoR/N HTTOR/VEY United States Patent This invention relates to the production of cast separable fastener stringers, wherein scoops are formed at spaced intervals along the beaded edges of a stringer tape. More particularly, the invention deals in a method of supporting the end portion of the tape beyond the bead at a position angular to the scoops in simplifying the pro duction of what are generally referred to as concealed-type of scoops and, wherein, means is provided, adjacent the dies, for support of the tape in a folded position for guidance into the dies in said folded position.

The novel features of the invention will be best understood from the following description, when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and, in which, the separate parts are designated by suitable reference characters in each of the views and, in which:

FIG. 1 is a diagrammatic perspective View showing portions of two dies in open position, with the means for supporting the stringer tape in folded position, preparatory to passage into the dies.

FIG. 2 is an enlarged sectional view showing the vari-' ous die parts in closed position and illustrating a scoop cast upon the beadededge portion of the tape.

FIG. 3 is a view similar to FIG. 2, illustrating the dies and associate parts in open position for movement of the tape into the next successive casting position, after which, the dies and associate parts are again moved into the closed position of FIG. 2 in forming the next successive casting, the contour of one of the dies being diagrammatically illustrated.

FIG. 4 is a sectional detail view through a stringer tape and one of the scoops formed thereon with the tapes shown in a final folded position, the section being on the line 44 of FIG. 5; and

FIG. 5 is a face view of the structure shown in FIG. 4 and indicating diagrammatically one contour of the coupling end portion of the scoop.

My improved method deals with the formation of separable fastener stringers, wherein scoops of any suitable plastic or metal are cast on beaded edges of a stringer tape at spaced intervals in known manners and the distinctive feature in the present method resides in so constructing the dies and handling the tape as to dispose what I will term the mounting side portion of the tape in an angular relationship to the beaded side edge portion thereof in production of separable fastener stringers of the concealed scoop type and kind.

In illustrating one method of carrying my invention into effect, I have diagrammatically illustrated in FIG. 1 of the drawing adjacent portions of two dies 1t and 11 which, when in abutting relationship to each other, form the scoop cavity 12, the latter also being partially formed by an auxiliary die member 13 movable in a path at right angles to the movement of the dies and 11 toward each other. The dies 1d and 11 are also fashioned to re ceive a transfer core pin 14 which extends into a lug forming cavity 15 which, in the casting operation, forms a transfer lug 16 on the pin for shifting the cast scoop 17 out of the path of the dies cavities 10, 11', in preparing for formation of a next successive scoop on the beaded edge portion 18 of a stringer tape 1?. For purposes of description, the side edge portion 20 of the stringer tape LE FASTENER the bead and a narrow portion of the tape adjacent thebead, in the casting operation. In the construction shown, the side edge portion 20 is disposed at right angles to the beaded edge portion 18 and the die 10 also has a recess 21 therein, note FIG. 1, in which the side portion 20 is arranged.

Considering FIGS. 4 and 5 of the drawing, each scoop of the stringer. may be said to comprise a coupling end portion 22 disposed at one side 23 only of the scoop; whereas, the other side 24 of the scoop extends onto the stringer tape beyond the bead to form what may be termed a tape positioning and fold member and this member joins the side 23 in what is generally referred to as the mounting end portion 25 of the scoop, the latter encircling the bead 18 of the tape. The structure of the coupling end portion 22 of the scoop may be of any desired contour and, in FIG. 5 of the drawing, one form of scoop is illustrated and it will be apparent that the member 24 extends sufficiently beyond the tape bead 18, so that the surface 24', note'FIG. 4, will arrange the angularly extending portion 20 of the tape 19 to bring the tape of one stringer into abutting engagement with the tape of a companion stringer when two stringers are coupled together. This will clearly appear from a consideration of FIG. 5 of the drawing, where the edge 20' of the tape is on what might be termed the pitch line between the engaged portions of the scoops of coupled stringers and, in FIGS. 4 and 5, the mounting side portion 20 of the scoop is shown folded over the side 24 and extending for attachment to a suitable support.

Returning now to FIG. 1 of the drawing, it will appear that the transfer pin 14 is arranged in what might be termed a tape folding member or block 26 arranged above the dies and fashioned to receive the tape 19 in the desired folded position for guidance into position between the dies and in the recess 21. As the transfer pin 14 moves downwardly in feeding a cast scoop out of regis nation with the dies, the tape 19 is moved downwardly through the member 26 in positioning the next adjacent portion of the tape between the cavities of the dies.

Considering FIG. 2 of the drawing, where the dies are shown in their closed position, it will appear that the auxiliary die member 13 seats upon a shoulder portion 27 of the die 11, note FIG. 3 of the drawing, and also upon the angularly extending side portion 20 of the tape 19, thus sealing the tape, not only on the offset 27 but also on the surface 28 of the die 10. It will be understood that the member 13 will apply suflicient pressure to the tape to elfect a positive seal, thus definitely controlling the contour of outer surfaces of the resulting cast scoop 17 After the cast scoop has moved to a position beyond the area occupied by the dies, suitable means is provided for trimming off the cast lug 16 in a manner known in the art, thereby producing the contour as clearly illustrated in FIG. 4 of the drawing.

In the formation of metal scoops, as illustrated in the accompanying drawing, the cast metal will extend into the interstices of the braid of the tape and, thus, securing the tape definitely upon the surface 24'. However, when plastic types of scoops are formed, the extent of the adhesion is not as great but will be sufficient to retain the tape in the angular position, as illustrated in the drawing.

By virtue of this method of procedure, it will be understood that the positioning of the angularly extending portion of the tape can be definitely controlled and, thus, suit any end result which may be desired.

It will be noted, from a consideration of FIG. 3 of the drawing, that, when the dies 10, 11 are separated, the

auxiliary die member 13 also moves away from the surface of the tape, so as to facilitate free movement of the cast'scoop and the'tape out of the path of the dies. 7

The dies 10 and 11, including the supplemental die 13, may be said'toform the major portion of. the scoop cavity and, in this connection, the supplemental die 13-, in additionto abutting the edge 27, also lies snugly upon the surface 27 of the die 11 incompleting thecavity; whereas, the angular portion of the tape, which is sealed by pres- Tsure engagement of the tape on the surface 28, actually forms the remainder of the scoop cavity and the member successive section of the tape in position to receive the next successive cast scoop, then partially closing the dies and stripping the transfer core from said lug and returning a the same into position between the dies, preparatory to 24 of the scoop or the surface 24 thereof is adhered to the angular extending portion of the tape. It will also be understood that, in stripping the transfer core 14 from the 7 cast lug 16, the dies 1t} and 11 are partially closed toenformed on tapes or fabric mounts of different types and' kinds, the distinctive feature in all instances being that, in accordance with my method,.the tape or mount is so supported in conjunction with thedies as to form apart of V the cavity defining a portion of the contour of the cast product. It will also be understood that, in accomplish- V *ing this result, the tape ormouut is supported between at least two of the dies in elfecting the seal at the bordering edges of that part of the tape or mount which forms said part of the die cavity. In the same manner, it will be 7 understood that the present disclosure of the invention deals with the formation of a single scoop on a stringer."

However, as known in'the art, the scoops can be cast in multiples on the stringer tape and, further, othercast products can be formed in multiples upon a fabric mount. Having fully described my invention, what I claim as new and desire to secure by Letters'Patent is:

1. The method of casting separable fastener scoops at spaced intervals along the beaded-edge portion of a stringer tape, which consists in supporting the mounting side edge portion of a stringer tape angulariy to the beaded edge portion preparatory to positioning the tape between a pair of dies having cavities for forming the scoops on the beaded edge portionof the *tape, arranged a transfer core between the dies when in closed position, movinga supplemental die member into pressure engagement with the angularly disposed portion of the tape adjacent said performing the next successivecastiug operation, forming on one of the dies a bordering surface, on which the angularportion of the tape is pressure sealed by said supplemental die, and the other or said first named dies ineluding surfaces engagedrby the supplemental die'in completing the cavity of said supplemental die.

2. The method of: forming castings on a fabric tape, which consists in arranging a tape between a plurality of dies with parts of the tapespaced from the beaded edge portion thereof in angular relationship to the remainder of said tape, forming the cavity of the product to be cast for the major part by said dies, the remainder of said cavity being formed by one angular portion of the tape, utilizing one of the dies for backing-up said last named angular portion of the tape and firmly supporting the same on another of said dies to resist pressure of molded material injected into the die cavity, adhering the cast material to the surface of said angular portion of the tape exposed to the die cavity, supporting a transfer core be-- toward and from each other and said fabric support, one

die having a cavity forming part of the casting on one side of the support, the other die having a cavity forming a cast portion on the other side of the support, said dies having registering portions to extend the casting over one edge portion of the support, a third-die movable angularly toward and from said first named dies for supporting the fabric'support between the last named die and at least one of the first'named dies in completing the cavity portion of said dies, and a member adjacent said dies for arranging edge portions of the fabric support angularly to each other to dispose one edge portion between the first named dies and the other angular edge portion between at least one of the first named dies and the third named die.

References Cited in the file of this patent UNITED STATES PATENTS 2,392,684 Morin Jan. 8, 1946 FOREIGN PATENTS 783,453 Great Britain Sept. 25, 1957 

